package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
@Component
public class RedisIdWoker {


    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1757808000L;
    /**
     * 序列号的位数
     */
    private static final int COUNT_BITS = 32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String keyPrefix){
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //生成序列号
        //1.获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        //2.自增长
        long count = stringRedisTemplate.opsForValue().increment("icr" + keyPrefix + ":" + date);

        //拼接并返回

        return timestamp << COUNT_BITS  | count;
    }


   
}
